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Selective extraction of rare earth elements from red mud using oxalic and sulfuric acids | |
Wanyan Li; Zehai Li; Ning Wang![]() ![]() | |
2022 | |
Source Publication | Journal of Environmental Chemical Engineering
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Volume | 10Issue:6Pages:108650 |
Abstract | Red mud is an alkaline industrial solid waste discharged from alumina production via the Bayer process and can be considered a kind of potential resource of rare earth elements (REEs). Many valuable metals such as iron, aluminum, and titanium also exist in red mud. A multi-stage extraction method was proposed in this study by taking full account of the REEs’ occurrence in red mud. Firstly, the pretreatments of oxalic acid leaching, roasting, and dilute hydrochloric acid leaching were employed to recover iron and enrich REEs in the residue. Subsequently, sulfuric acid leaching was used to selectively dissolve REEs into the leaching solution. Finally, the effects of sulfuric acid concentration, liquid-solid ratio, reaction temperature, and reaction time on the leaching efficiency of REEs were then investigated. The results show that the maximum extraction of the REEs reached 80 % and less than 4 % of Fe, Na, Ca, Ti and Al were extracted under the experimental conditions of 1 mol/L H2SO4, 3 h, 95 °C, and the liquid-solid ratio of 5:1 mL/g. The practicable approach by multi-stage extraction of acid leaching and roasting can split iron and REEs from red mud. |
Keyword | Red Mud Rare Earth Elements Selective Extraction Oxalic Acid Sulfuric Acid |
DOI | 10.1016/j.jece.2022.108650 |
URL | 查看原文 |
Indexed By | SCI |
Language | 英语 |
Citation statistics | |
Document Type | 期刊论文 |
Identifier | http://ir.gyig.ac.cn/handle/42920512-1/13526 |
Collection | 地球内部物质高温高压实验室 环境地球化学国家重点实验室 地球深部物质与流体作用地球化学研究室 |
Affiliation | 1.Key Laboratory of High-temperature and High-pressure Study of the Earth’s Interior, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550081, China 2.State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550081, China 3.University of Chinese Academy of Sciences, Beijing 100049, China |
Recommended Citation GB/T 7714 | Wanyan Li,Zehai Li,Ning Wang,et al. Selective extraction of rare earth elements from red mud using oxalic and sulfuric acids[J]. Journal of Environmental Chemical Engineering,2022,10(6):108650. |
APA | Wanyan Li,Zehai Li,Ning Wang,&Hannian Gu.(2022).Selective extraction of rare earth elements from red mud using oxalic and sulfuric acids.Journal of Environmental Chemical Engineering,10(6),108650. |
MLA | Wanyan Li,et al."Selective extraction of rare earth elements from red mud using oxalic and sulfuric acids".Journal of Environmental Chemical Engineering 10.6(2022):108650. |
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